Re: [opensuse] bash - why doesn't the tldp bash beginners guide for loop example work?

15 Feb 2008

      Anders Johansson wrote:
...
On Thursday 14 February 2008 05:41:23 David C. Rankin wrote:
...
Listmates,
I have run into a bash problem with a simple for loop I don't
understand and would like input from the gurus to determine if the tldp
documentation is in error or if it is me. Safe money says it's me, but
here is the situation.
I am using example 9.1.2.2. from the following link to construct a
simple for loop to extract a directory full of zip files:
http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_09_01.html
The example give is:
[carol@octarine ~/html] cat html2php.sh
#!/bin/bash
# specific conversion script for my html files to php
LIST="$(ls *.html)"
for i in "$LIST"; do
      NEWNAME=$(ls "$i" | sed -e 's/html/php/')
      cat beginfile > "$NEWNAME"
      cat "$i" | sed -e '1,25d' | tac | sed -e '1,21d'| tac >> "$NEWNAME"
      cat endfile >> "$NEWNAME"
done
This is actually in a tutorial? Wow
for i in *; do
   NEWNAME=${i%html}.php
   echo beginfile > "$NEWNAME"
   sed -e '1,25d.........
...
So I created the following:
#!/bin/bash
LIST="$(ls *.zip)"
for i in "$LIST"; do
         unzip $i -d
/mnt/nemesis-cfg/home/samba/computer/software/fonts/extract
         echo "Unzipped: $i to ../extract"
done
exit 0
for i in *.zip; do
   unzip "$i" -d /mnt/nemesis-cfg/home/samba/computer/software/fonts/extract
done
You want to have the quotes around $i to guard against spaces in file names
Anders
Anders,

	I found the quotes around "$i" do not work for managing filenames with 
spaces. The filenames, spaces and all, are pulled in by the LIST="$(ls 
*.zip)". Quoted or unquoted, it makes no difference, because $i is just 
the next element in the list. Example: goodfile 001.jpg exists in the 
list as:

goodfile 001.jpg

	for i $list; do
		echo "i = $1"
	done

gives:

i = goodfile
i = 001.jpg

regardless.

	Stumbling around, it seems if you include AFS='\n' it will keep the 
loop from breaking on spaces by specifying that it only break on 
newlines and not spaces. So filenames with spaces (all my wife's digital 
pictures are) this is the only thing I have found to work without 
extensive character and replacing spaces with '_':

	AFS='\n'
	for i $list; do

	Telling the loop not to break on spaces with AFS seems to work like a 
charm. Are there any better ways?
		echo "i = $1"
	done

-- 
David C. Rankin, J.D., P.E.
Rankin Law Firm, PLLC
510 Ochiltree Street
Nacogdoches, Texas 75961
Telephone: (936) 715-9333
Facsimile: (936) 715-9339
www.rankinlawfirm.com
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